ANSWER - Oh good Goddess! If I answered your question with half the information you are looking for, I could probably get arrested. I’d have to be completely certifiable to give you a recipe for flying ointment using baneful herbs. Do you actually know what a baneful herb is? It’s a herb that causes death. Yes – death. Not a bit of a high or a bit of a giggle on a Saturday night, death. Some of the baneful herbs can’t even be handled without gloves. Only a very skilled herbalist should even think of making this type of mixture. To be honest, were I to want one myself I would probably go to someone else to make it for me. And even then I’d be taking a risk – dosages vary between plants and between individuals. Herbs are not an exact science. Think of making a random baneful flying potion as a bit like swallowing 300 paracetamol and then jumping off a really tall building - just to make sure.
I’d be surprised if you found a reputable supplier for this type of herb already grown – I’m not sure of the legality surrounding some of the plants (some of which are actually wild and grow native to the UK) but normally the only way to acquire the really poisonous plants is in seed form. Which brings you on to a minefield of problems with growing them (presumably) hiding them and knowing how to treat them in order to make the flying ointment. My advice is to forget baneful herbs.
But before you do forget them – a word of warning, the effects of these herbs can be very potent and extraordinary. Some of these potions make the chemical drugs you can get off your local dealer seem like candyfloss. The effects of having your mind altered to this degree can cause permanent irreversible psychological harm. Yes people do use them safely but even experienced witches have died from taking the risk. And taking them for recreational use is idiotic in the extreme.
However the good news is that you can make flying ointments without resorting to the use of poisons. I’m not posting anything on my site that I haven’t personally tried (and certainly nothing that breaks the law) but when I’ve pulled together a few recipes (that will most definitely not contain baneful herbs) that I am happy with, I will put them up. In the meantime, please be careful taking random recipes off the internet. If it is something that really, really interests you, take up the study of herbs and be prepared to wait a few years until you have mastered the knowledge and skills to make your recipes properly and as far as can be, safely.
Image http://www.sxc.hu/browse.phtml?f=view&id=1394493 (krapweiss)